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Angular-contact double-row ball bearings with the contact angle 60 degree. Specifications
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Safety of power transformers, power supplies, reactors and similar products. Part 2-8. Particular requirements and tests for transformers and power supply units for bells and chimes
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Thermistors. Methods for measuring the hot resistance and maximum heater power
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System of standards on information, librarianship and publishing. Publications. Indexes
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